<template>
  <view>
    <view class="search-box">
      <uni-search-bar placeholder="请输入搜索内容" :radius="100" @input="input" cancel-button="none"></uni-search-bar>
      <!-- <uni-search-bar @confirm="search"  ></uni-search-bar> -->
      <!-- 搜索建议列表 -->
      <view class="sugg-list" v-if="searchResults.length !== 0">
        <view class="sugg-item" v-for="(item, i) in searchResults" :key="i" @click="gotoDetail(item)">
          <view class="goods_name">{{item.goods_name}}</view>
          <uni-icons type="arrowright" size="16"></uni-icons>
        </view>
      </view>
      <!-- 搜索历史区域 -->
      <view class="history-box" v-else>
        <!-- 标题区域 -->
        <view class="history-title">
          <text>搜索历史</text>
          <uni-icons type="trash" size="18" @click="clean"></uni-icons>
        </view>
        <!-- 列表区域 -->
        <view class="history-list">
          <uni-tag :text="item" v-for="(item, i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
        </view>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        //延时器
        timer: null,
        //搜索关键词
        kw: '',
        // 搜索结果列表
        searchResults: [],
        // 搜索历史列表
        historyList: []
      };
    },
    onLoad() {
       this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    methods: {
      input(e){
        // 清除timer对应的延时器
        clearTimeout(this.timer)
        this.timer = setTimeout(() => {
          // 在500毫秒内,没有触发新的输入事件,则为搜索框关键词赋值
          this.kw = e
          this.getSearchList()
          // console.log(e)
        },500)
      },
      async getSearchList(){
         //判断关键词是否为空
        if(this.kw === ''){
          this.searchResults = []
          return
        }
         //发起请求，获取搜索建议列表
        const { data: res } = await uni.$http.get('/api/public/v1/goods/qsearch', {query: this.kw})
        if(res.meta.status !== 200) return uni.$showMsg()
        this.searchResults = res.message
        // console.log(res)
        this.saveSearchHistory()
      },
      //跳转到商品详情页
      gotoDetail(item){
        // console.log(item)
        uni.navigateTo({
          url:'/subpkg/goods_detail/goods_detail?goods_id'+item.id
        })
      },
        //保存关键词方法，直接把搜索建议push到historyList数组中
      saveSearchHistory(){
        // this.historyList.push(this.kw)
        const set = new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        this.historyList = Array.from(set)
        // console.log(set)
        //将搜索历史永久化的储存到本地
        uni.setStorageSync('kw', JSON.stringify(this.historyList))
      },
      clean(){
        this.historyList = []
        uni.setStorageSync('kw', '[]')
      },
      gotoGoodsList(kw){
        console.log(kw)
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?query='+kw
        })
      },
    },
    computed: {
      histories(){
        return [...this.historyList].reverse()
      }
    },
  }
</script>

<style lang="scss">
  // <!-- 搜索框吸顶效果 -->
  .search-box{
    position: sticky;
    top: 0;
  z-index: 999;
  }
  .sugg-list{
    padding: 0 5px;
    .sugg-item{
      display: flex;
      align-items: center;
      padding: 13px 0;
      font-size: 12px;
      border-bottom: 1px solid #efefef;
      // justify-content: space-between;
      .goods_name{
        //文本不允许换行
        white-space: nowrap;
        //溢出部分隐藏
        overflow: hidden;
        //当溢出是，用...代替
        text-overflow: ellipsis;
        margin-right: 3px;
      }
      
    }
  }
  .history-box{
    padding: 0 5px;
    .history-title{
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
      height: 40px;
      border-bottom: 1px solid #efefef;
    }
    .history-list{
      display: flex;
      flex-wrap: wrap;
      .uni-tag{
        // margin: 100px 100px;
        margin: 5px 5px;
        // background-color: #cccfd6;
      }
    }
  }
  
</style>
